SHARP SP1993 Technical Report

Date: Apr. 10, 1996

COPIER : SF-2040

1. IC DAMAGE PREVENTION AND BL ERROR PREVENTION.

2. REGARDING BLACK STREAKS / HUMIDITY IN THE DV UNIT AND CROOKED HOLDER MR
ATTACHMENT.

3. MEASURE TO PREVENT THE HARNESS FROM BEING PINCHED.

4. MEASURE TO PREVENT THE SOLENOID ATT A CHMENT PLATE FROM DISTORTING.

No. : SP-1993

1. IC damage prevention and BL error prevention.

1.Model name: SF-2025/2030/2040

2.General: Diodes have been added to the main PWB as a measure to improve the problems

described below.

(1) T o prevent damage to the IC due to the ADF connector insertion when the machine

is turned ON.
(2) To prevent BL error flashing due to high voltage leaks.
(3) Circuit additions in accordance with the addition of a DFM. (This measure has been

carried out only on model SF-2040.)

3.Description: Measure for problems (1) and (2) described above.:
Diodes (VHD1SS133//-1) have been added to the main PWB.
Added location → D134, D135, D136, D138 have been silk screened.

Measure for problem (3) described above. (carried out only on model SF-2040):

A diode (VHDDSM1D1//-1) has been added to the main PWB.
Added location → D137 has been silk screened.

The silk screening on the main PWB has been changed in accordance with the
changes described above.

N1133FC-1 → N1133FC-2

4.Action: From the start of 1996 February production. (Back side attachment of the above parts

has been carried out as a temporary measure since the start of mass production.)

SHARP CORPORATION Reprography Division

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Green

C

2. Regarding black streaks / humidity in the DV unit and crooked holder MR
attachment.

1.Model name: SF-2025/2030/2040

2.General: (1) The shape of cover D of the DV unit has been changed in order to eliminate black

streaks and alleviate rising temperatures.

Old New

Side F of cover D

Side R of cover D

(2) The shape of box D of the DV unit has been changed in order to improve looseness

in the attachment of holder MR and eliminate bit insertion misses.

Measure to improve looseness in the attachment of holder MR.

Measurements of section A
Old New

Side R of box D

0.05

ø20+
0

→ ø19.95+

0.05
0

Measure to eliminate bit insertion misses

Diagram of the top face of box D

The change in bit insertion was carried out at the location indicated
by the circles in the diagram.

Note: There are three other locations where the change described in above was carried

out, but only a representative example of the change has been shown in this report.

3.Action: SF-2040 → From 1995 mid-October production.
SF-2025/2030 → From 1995 mid-November production.

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